This paper analyzes the working principle of the circulating water pump after the double-speed revamping from a theoretical point of view in parallel operation. Combining the performance test of the double-speed circulating water pump under the single and the parallel operation conditions, the economical comparison of various operating modes is made. The measures to improve the operating efficiency of circulating water pump are put forward, which provide the basis for scientific and reasonable guidance on energy saving operation of circulating water pump. First, the existing problems: thermal power plants, circulating pumps is one of the auxiliary power larger. Unit of the power plant circulating water system, each unit is generally equipped with 2 circulating pumps, in operation is often a pump running alone or 2 pumps in parallel operation. As the unit is often in variable load operation, and affected by the season, when the circulating pump is only a single run, the circulating water flow may be insufficient, resulting in low condenser vacuum; when the circulating pump double pump parallel operation, and too much water too Large, resulting in power plant waste. Second, to improve the efficiency of circulating pump measures: (A) of the circulating pump to implement two-speed transformation to improve operational efficiency Hebei Nanwang a power plant 2 units for the subcritical, a reheat, single-shaft four-cylinder four exhaust 660MW pure Condensing steam turbine. Each unit is equipped with three 1800HTCX-type oblique flow circulating pump, 2 runs, one spare. The plant was retrofitted to a circulating water pump at the end of 2008 to change the number of motor poles so that the motor could run at 2 speeds. Firstly, the working principle of the modified two-speed circulating pump was analyzed in parallel. Secondly, based on the pump efficiency test of the two-speed circulating pump under the single and parallel operating conditions, the economic comparison of various operating modes was carried out. The measures to improve the operating efficiency of circulating water pump are put forward, which provide the basis for scientific and reasonable guidance on energy saving operation of circulating water pump. 1, circulating pump works Large-scale power plant circulating pump generally uses two modes of operation: single pump operation or double pump operation in parallel. After two-speed transformation of the circulating pump parallel operation is generally double-pump low-speed parallel operation, dual-pump high-speed low-speed parallel operation and double-pump high-speed parallel operation. 1.1, a single pump working principle of the pipeline performance curve and the pump itself with the same performance curve drawn on the same chart, the intersection of the two curves is the pump operating conditions, also known as the working point. Shown in Figure 1, where I is the pump performance curve, â…¢ is the pipeline performance curve, M point is the pump operating conditions stable operation. Figure 1 Single pump operation Figure 2 The same performance pump in parallel operation 1.2, the same performance Pump parallel operation principle Figure 2 for the same performance when the pump running parallel performance curve. Figure I, II for the same performance pump performance curve, â…¢ for the pipeline characteristics of the curve, the performance of a single pump flow curve in the lift equal conditions can be superimposed, you can get parallel performance curve I + â…¡. Figure 2, the pipeline curve and pump parallel performance curve of the intersection M, that is, when working in parallel. Paralleled single pump condition, by the M point for the horizontal axis of the parallel with the single pump characteristic curve at point C, that is, each pump in parallel when the operating conditions point, at the same time we can see the parallel flow of each pump Q. Figure 2 shows the parallel work features: 2 pumps work in parallel when the lift and parallel work of a single pump head equal to the total flow of parallel delivery of each pump and flow. The parameters of each pump in parallel with the parameters of each pump in parallel after the comparison shows that: the parallel operation of each pump when the working flow is less than the individual pump working flow, while the separate pump working flow is less than double pump parallel working flow, Qc 1.3, different Performance of the pump working in parallel Figure 3 for the performance of different performance pump parallel operation. Figure I, â…¡ for the performance of two different pump performance curve, â…¢ for the pipeline characteristic curve, parallel work performance curve I + â…¡. As can be seen from Figure 3: Each pump before the parallel operating conditions were B, B two points, the flow of QB1, QB2. Compared with the working point of the pump in parallel, it can be seen that the flow QM of the two pumps in parallel is smaller than the sum of the flow QB1 and QB2 of each pump before the parallel connection. 2 pumps in parallel after the lift is greater than the head of each pump in parallel. The flow rate of two pumps with different performance in parallel is equal to the sum of the flow rates Qc1 and Qc2 of each pump in parallel. When the total flow rate in parallel is less than the sum of the flow rates when each pump operates in parallel before the parallel operation, the degree of decrease is proportional to the pump Increasing the number of parallel units, piping characteristics of the steep increase. Chart 3 different performance pump parallel operation Table 1 circulating pump performance test data and calculation results (B), choose a reasonable mode of operation has great potential for energy saving 1, circulating pump running test research &
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